The answer to 'why is my shingles damaged' is that there are several common causes, including weather exposure, age, and improper installation. Damaged shingles can show signs like curling, cracking, or missing granules. Solutions may involve repairing or replacing the damaged shingles, or in some cases, the entire roof.
If the damage is minor, you may be able to DIY the repairs. However, for more extensive damage or if you're unsure of the cause, it's best to call a professional roofing contractor to inspect and provide the appropriate solution.